Campaigners took to the streets of Dublin and Belfast on 5 December as they made the final call for a fair and safe global climate deal ahead of the UN's Copenhagen summit.
The Wave, organised by the Stop Climate Chaos coalition, saw campaigners gather simultaneously in major cities all across Europe to demand climate justice at December's talks, which start in the Danish capital on Monday.
Irish Times Protest calls for climate deal
BBC In pictures: The Wave
Hundreds gather in Belfast
Around 500 people turned out on a grey Saturday in Belfast to show their support for strong and urgent action on climate change.
The event had a fun feel with excellent performances by local musicians and creative blue costumes adding colour to the day.
Local politicians also lent their support including the Lord Mayor of Belfast, Naomi Long.
Ms Long commended the day saying, 'I'd like to thank everybody involved in organising this event, it gave people from Belfast and across Northern Ireland the opportunity to add their voices to the voices all around the world; making that call to political leaders who go to Copenhagen next week to actually come up with the goods and deliver on this issue.'
Dave Thomas of Christian Aid added that the Belfast Wave sent a message politicians couldn't ignore.
'It is essential that our politicians get the message... Christian Aid believes that it is an injustice that climate change is already having a disproportionate impact on some of the poorest communities in the world.'
Flooding the streets of Dublin
And at the same time, over in Dublin, hundreds more people dressed in blue flooded the streets of the city.
Setting off from the Department of the Environment at Custom House Quay the action ended with a giant human wave outside the Taoiseach’s office on Merrion Square.
Strong and clear
Christian Aid would like to say a huge thank you to all of our great supporters who took time to join The Wave.
Colourful faces and raised voices made the message from the two cities strong and clear - we demand a fair and safe global climate deal from Copenhagen.
More from The Wave
Take a look at what happened when The Wave went to London and Glasgow.
